[BROWSEUI] Accept relative path on Address Bar (#8633)

Improve usability of Address Bar.
JIRA issue: CORE-19704
- Modify CAddressEditBox::ParseNow
to accept relative path.
- Add SBSP_SAMEBROWSER |
SBSP_ABSOLUTE flags for
IShellBrowser::BrowseObject.

dll/win32/browseui/addresseditbox.cpp

···
     CComPtr<IShellFolder> psfCurrent;
     HRESULT hr;
 
-    ATLASSERT(!m_pidlLastParsed);
+    m_pidlLastParsed.Free();
 
     CComPtr<IBrowserService> pbs;
     hr = IUnknown_QueryService(fSite, SID_SShellBrowser, IID_PPV_ARG(IBrowserService, &pbs));
···
     if (FAILED_UNEXPECTEDLY(hr))
         goto parseabsolute;
 
-    hr = psfDesktop->BindToObject(pidlCurrent, NULL, IID_PPV_ARG(IShellFolder, &psfCurrent));
-    if (FAILED_UNEXPECTEDLY(hr))
-        goto parseabsolute;
+    if (!pidlCurrent->mkid.cb)
+    {
+        psfCurrent = psfDesktop;
+    }
+    else
+    {
+        hr = psfDesktop->BindToObject(pidlCurrent, NULL, IID_PPV_ARG(IShellFolder, &psfCurrent));
+        if (FAILED_UNEXPECTEDLY(hr))
+            goto parseabsolute;
+
+        WCHAR szPath[MAX_PATH], szFullPath[MAX_PATH];
+        if (PathIsRelativeW(address) && SHGetPathFromIDListW(pidlCurrent, szPath))
+        {
+            PathAppendW(szPath, address);
+            if (GetFullPathNameW(szPath, _countof(szFullPath), szFullPath, NULL))
+            {
+                address.Free();
+                SHStrDupW(szFullPath, &address);
+            }
+        }
+    }
 
-    hr = psfCurrent->ParseDisplayName(topLevelWindow, NULL, address, &eaten,  &pidlRelative, &attributes);
+    hr = psfCurrent->ParseDisplayName(topLevelWindow, NULL, address, &eaten, &pidlRelative, &attributes);
     if (SUCCEEDED(hr))
     {
         m_pidlLastParsed.Attach(ILCombine(pidlCurrent, pidlRelative));
-        return hr;
+        return S_OK;
     }
 
 parseabsolute:
···
 
         if (!m_pidlLastParsed)
             return E_FAIL;
+
         bParsedForExec = TRUE;
     }
 
···
     /*
      * Attempt to browse to the parsed pidl
      */
-    hr = pisb->BrowseObject(m_pidlLastParsed, 0);
+    hr = pisb->BrowseObject(m_pidlLastParsed, SBSP_SAMEBROWSER | SBSP_ABSOLUTE);
     if (SUCCEEDED(hr))
         return hr;